A roller coaster car is stationary at the top of a hill. Based on the diagram shown, what kind/kinds of energy does the roller c

Physics

Work, power & energy Solutions

1 Review In a hydroelectric dam, water falls 35.0 m and then spins a turbine to generate electricity. Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. IMA ? Value Submit Request Answer Part B Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 45.0 MW of electricity? This is a typical value for a small a hydroelectric dam. Express your answer in kilograms per second. EVO AL kg/s

Physics

Work, power & energy Solutions

The blocks are forced together, compressing a spring between them by a distance x; (the force constant of the spring is k) then the system is released from rest on a level, frictionless surface. The spring, which has negligible mass, is not fastened to either block and drops to the surface after it has expanded. What is the speed that block A acquired, VA? O 2 mak mamy 30 myk mamo+ma k 2 matm? 2 k ma tmp

Physics

Work, power & energy Solutions

Santa's elf needs to move a gift box 6 meters across the room, then 0.5 meters up onto a shelf. Which of the following would require the LEAST amount of work? O lifting the box up 0.5 m, then carrying it across the room and placing it on the shelf O pushing the box 6 m across the floor, then lifting it 0.5 m and placing it on the shelf O all scenarios require the same amount of work O not enough information O no work is done on the box in any scenario O lifting the box up 0.25 m, carrying it halfway, setting it down to rest, then picking it up and carrying it to the shelf